etl pipeline

MongoDB: Gathering Pipeline, It appears in MongoDB2.2. A data aggregation framework based on data processing pipeline conceptual modeling. The document enters a multi-stage pipeline that can convert the document into clustering results. The clustering pipeline provides a substitute for the map-reduce method and is the

inter-process communicationeach process has a different amount of user address space, the global variables of any process can not be seen in another process, so the process to exchange data must pass through the kernel, in the kernel to open a buffer, process 1 data from the user space to the kernel buffer, Process 2 Then reads the data from the kernel buffer, a mechanism provided by the kernel called interprocess communication (ipc,interprocess communication). the way to implement interprocess

1. Background Once I met this requirement: application a (which can be encoded and compiled by myself) calls a console application B (which cannot be modified by a third party ), console program B prints data on the standard output device (similar to the command line window). Application A needs to obtain and process the data. After this requirement is met, the following implementation methods are summarized: "Pipeline" and "redirection ". This sectio

-------------------------------------------------------------------------------- Download all source programs in this section Overview Windows introduces multi-process and multi-thread mechanisms. At the same time, it also provides communication means between multiple processes, including clipboard, DDE, Ole, and pipelines. Compared with other communication means, pipelines have their own restrictions and characteristics, the MPs queue is actually a shared memory zone where the process places th

After Microsoft's acquisition of GitHub, many people suspect that Microsoft may be able to cut VSTS, but the fact that VSTS has not been cut off, more information about Azure DevOps can be viewed in this blog, if you want to view the original text can also be viewed from the source address provided in the link.Today's introduction to the CI section of Azure DevOps: Azure Pipeline . The big good news for open source developers after the VSTS upgrade to

Preface to the message processing pipeline for the Web APIMVC has a mechanism for request processing, and of course the Web API has its own set of message-processing pipelines, which are always done through Httpmessagehandler. We know that the request information exists in the Requestmessage, and the response information exists in Responsemessage, when the request information enters the pipeline, at this ti

The reason that ASP. NET core is a Web development platform is that it has a highly extensible request processing pipeline that we can customize to meet the HTTP processing needs of various scenarios. Asp. NET core applications, such as routing, authentication, sessions, caching, and so on, also customize the message processing pipeline to achieve. We can even create our own web framework on the ASP. In fac

The reason that ASP. NET core is a Web development platform is that it has a highly extensible request processing pipeline that we can customize to meet the HTTP processing needs of various scenarios. Asp. NET core applications, such as routing, authentication, sessions, caching, and so on, also customize the message processing pipeline to achieve. We can even create our own web framework on the ASP. In fac

: This article mainly introduces nginx's analysis of keepalive and pipeline request processing. For more information about PHP tutorials, see. Original article, reprinted please note: Reprinted from pagefault Link: nginx analysis of keepalive and pipeline request processing This time, we mainly look at how to process keepalive and pipeline in nginx. we

New appearing in the MongoDB2.2.Aggregation pipeline data aggregation framework based on conceptual modeling of data processing pipelines. The document enters a multi-stage pipeline that translates the document into aggregated results.The aggregation pipeline provides alternatives to the Map-reduce method and is the preferred solution in many aggregation tasks, b

When item is collected in the Spider, it is passed to item Pipeline, and some components perform the processing of the item in a certain order.Each item pipeline component (sometimes referred to as "item Pipeline") is a Python class that implements a simple method. They receive the item and perform some behavior through it, and also determine whether the item con

I will upload my new book "Write CPU by myself" (not published yet). Today is 15th articles. I try to write them every Thursday. In the previous chapter, the original five-level pipeline structure of openmips is established, but only one Ori instruction is implemented. It will be gradually improved from this chapter. This chapter first discusses issues related to pipeline data, then modifies openmips to s

PipelinePipelines are the oldest form of Unix IPC, a special file in memory that can only be used between processes that have a common ancestor (that is, parent-child processes, sibling processes).Pipelines are created by the pipe function#include int pipe (int fd[2])Fd[1] Write, fd[0] read.The pipeline for a single process is almost useless, and the process that calls the pipe then calls Fork, creating a pipeline